How do similarities in the bones of humans dolphins and horse and

1 answer:

6 0

It provides evidence that each organism is related and similar in each way, leading to the conclusion of a common ancestor.

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The microwaves in an oven are of a specific frequency that will heat the water molecules contained in food. (This is why most pl

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Answer:

2E-24

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3 years ago

Why is it important for us to study outer space?

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So you know the things about outer space like facts that you might not know

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Draw the product that valine forms when it reacts with excess CH3CH2OH and HCl followed by a wash with aqueous base.

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Answer:

Product: ethyl L-valinate

Explanation:

If we want to understand what it is the molecule produced we have to analyze the reagents. We have valine an amino acid, in this kind of compounds we have an amine group ( $NH_2$ ) and a carboxylic acid group ( $COOH$ ). Additionally, we have an alcohol ( $CH_3CH_2OH$ ) in the presence of HCl (a strong acid) in the first step, and a base ( $OH^-$ ).

When we have an acid and an alcohol in a vessel we will have an esterification reaction. In other words, an ester is produced. As the first step, the oxygen in the C=O (in the carboxylic acid group) would be protonated. In the second step, the ethanol attacks the carbon in the C=O of the carboxylic acid group producing a new bond between the oxygen in the ethanol and the carbon in the carboxylic acid. In step 3, a proton is transferred to produce a better leaving group ( $H_2O$ ). In step 4, a water molecule leaves the main structure to produce again the double bond C=O. Finally, a base ( $OH^-$ ) removes the hydrogen from the C=O bond to produce ethyl L-valinate

See figure 1

I hope it helps!

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3 years ago

Identify which statement describes the following process. 2Ce + 3Cu2+ → 3Cu + 2Ce3+

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Answer: A-Ce is oxidized because it is losing electrons and Cu is reduced because it is gaining electrons.

There are two reactions in the equation, oxidation and reduction. A molecule that oxidized will lose electrons while the molecule that reduced will gain electrons. In this case, Cu2+ changed into Cu which means its oxidation number reduced from +2 into 0. Ce oxidation number increased from 0 into +3

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Answer the following questions ( image) with the given options.

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3.Ca(HCO3)2

4. use of Ca(OH)2

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